Knot tying apparatus



FIG. 1 is a perspective view of a knot tying apparatus of the present invention;

FIG. 2 is a top view of a knot tying apparatus of the present invention;

FIG. 3 is a bottom view of a knot tying apparatus of the present invention;

FIG. 4 is a front view of a knot tying apparatus of the present invention; and,

FIG. 5 is a back view of a knot tying apparatus of the present invention.

The broken lines in FIG. 3 illustrate areas and features that form no part of the claimed design. 

The ornamental design for a knot tying apparatus, as shown and designed. 